how to extract substring in c# using regex

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Hi , following is the code :

//throw new NotImplementedException();
           Regex rdr = new Regex(@"<td><a href=""/wiki/\w+"" title=""(?<Title>\w+)"">""(?<TitleHR>.+?)""</a>");
           Match mt = rdr.Match(line);

           //if (mt.Success)
           //{
             //   AddState(mt.Groups[0].Value , mt.Value);
           //}

           if (rdr.IsMatch(line))
           {
               //Match mtc;
               //mtc = rdr.Match(line);
               //AddState(mt["Title"].Value, mt[1].Value);
               AddState(mt.Groups["Title"].Value, mt.Groups["TitleHR"].Value);

           }

Now when i try to match line the line doesnt match. I get ismatch as false

Following is the line :

<a href="/wiki/Alabama" title="Alabama">Alabama</a>

Posted 11-Apr-13 5:09am

shanalikhan

Updated 11-Apr-13 9:12am

Kenneth Haugland

v3

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Richard C Bishop 11-Apr-13 11:11am

If you want a substring just use the SubString method.

shanalikhan 11-Apr-13 14:56pm

i want to get 1+ string from it. how i can do it by subsstring

CHill60 11-Apr-13 11:15am

Can you post the sample data that you are using (line)

shanalikhan 11-Apr-13 14:56pm

Please have a look , i have updated the question

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OriginalGriff · Accepted Answer · 2013-04-11T05:26:00

Solution 1

You haven't used groups in your Regex! So all you will get is the whole string matched.
I'm just guessing that you want to break out the title and the human readable segment separately?
Try this:

<a href="/wiki/\w+" title="(?<Title>\w+)">(?<TitleHR>.+?)</a>

This breaks out two groups: "Title" and "TitleHR" which may be what you wanted.

If you are going to use regexes, then get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions. I use it, and wish I'd written it!

Posted 11-Apr-13 5:26am

OriginalGriff

Updated 11-Apr-13 9:06am

v2

Comments

shanalikhan 11-Apr-13 14:57pm

I tried it but im gettting ismatch as false by running the same code. Line to parse is also written. Please have a look on it.

OriginalGriff 11-Apr-13 15:07pm

Try the edited version above - the auto tag completer added a pile of cr@p and I didn't notice... Try it in Espresso first.

CHill60 12-Apr-13 6:33am

My +5 - thought it was something to do with no groups but wasn't confident enough - so I've learned something today as well - thank you!

OriginalGriff 12-Apr-13 6:57am

You're welcome!